FIX: CDC::CreatePointFont() May Create Wrong Size Font

 Last reviewed: September 19, 1997
Article ID: Q145696
4.00 WINDOWS NT kbprg kbfixlist kbbuglist kbcode

The information in this article applies to:

  • The Microsoft Foundation Classes (MFC) included with: Microsoft Visual C++, 32-bit Edition, version 4.0

SYMPTOMS

Calling CDC::CreatePointFont() results in a font that is not of the point size requested. This will occur when the y component of the DC's viewport origin is not at 0. A common place for this to occur would be in a CScrollView class where the user has scrolled the view vertically.

CAUSE

MFC uses DPtoLP() to map the given device coordinates to logical coordinates. The case where the viewport origin is not at 0 is not taken into consideration by this code.

RESOLUTION

Set the y component of the viewport origin to 0 before calling CreatePointFont(). The following code demonstrates the workaround. Here pDC is a pointer to a CDC.

Sample Code

/* Compile options needed: default
*/
POINT pt; SetViewportOrgEx(pDC->GetSafeHdc(), 0, 0, &pt); // set origin to 0,0 CreatePointFont(120, "Courier", pDC); SetViewportOrgEx(pDC->GetSafeHdc(), pt.x, pt,y, NULL); // restore origin

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This bug was corrected in Visual C++ 4.1.

Additional reference words: 4.10 4.00
KBCategory: kbprg kbfixlist kbbuglist kbcode
KBSubcategory: MfcMisc vcbuglist400 vcfixlist410
Keywords : MfcMisc vcbuglist400 vcfixlist410 kbbuglist kbcode kbfixlist kbprg
Technology : kbMfc
Version : 4.00
Platform : NT WINDOWS
Solution Type : kbfix

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Last reviewed: September 19, 1997
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